The PlotFcn option specifies one or more functions that an optimization
function calls at each iteration to plot various measures of progress while the algorithm
executes. The structure of a plot function is the same as that for an output function. For
more information on writing and calling a plot function, see Output Function. For an example of using built-in plot functions, Using a Plot Function.
To view a predefined plot function listed for PlotFcn, open the
function in the MATLAB® Editor. For example, to view the file corresponding to the norm of residuals,
enter:
edit optimplotresnorm.m